Production method of deinked pulp and environmentally-friendly white cardboard made of deinked pulp

Abstract

The invention discloses a production method of deinked pulp. The production method comprises the following steps of: (1) adding hot water and wastepaper raw materials to a drum pulper, and pulping the wastepaper raw materials; (2) removing material residues, and then enabling pulp to sequentially pass through a first-stage flotation tank, a multiple-disc filtering machine 1, a hot dispersion machine 1, a secondary-stage flotation tank, a multiple-disc filtering machine 2 and a dispersion machine 2 for carrying out impurity removal process so as to remove organic impurities in the pulp; (3) carrying out bleaching treatment on the pulp by using a high-concentration bleaching tower; (4) carrying out third-stage floatation treatment on the pulp; and (5) carrying out reduction bleaching treatment on the pulp by adopting a reduction bleaching tower so as to obtain the deinked pulp. The deinked pulp is used for producing the white cardboards and replacing conventional bleaching chemical pulp for coating and making the white cardboards, so that the cost of the white cardboards is reduced, the cycle use of fibers is improved, and the call of the nation for green and environmentally-friendly paper making is responded.

Description

Technical field [0001] The invention relates to the field of pulp production, in particular to a method for producing deinked pulp. The invention also relates to an environmentally friendly white cardboard manufactured by using the deinked pulp. Background technique [0002] White cardboard is a kind of thick and firm white cardboard made of pure high-quality wood pulp. It has high requirements for whiteness. It is mainly used for printing business cards, certificates, covers, trademarks, packaging and decoration. At present, white cardboard is manufactured from bleached chemical pulping. The process of using bleached chemical pulping to manufacture white cardboard is not conducive to environmental protection. It will generate a large amount of polluted waste water, which puts great pressure on the environment and is in the process of waste water recycling. It also puts considerable pressure on the enterprise, and the cost of the enterprise increases invisibly. [0003] In the fac...

AI Technical Summary

Problems solved by technology

At present, white cardboard is produced by bleaching chemical pulping. The process of making white cardboard by bleaching chemical pulping is not conducive to environmental protection, and will generate a large amount of polluted wastewater, which will put great pressure on the environment, and in the process of wastewater recycling It also puts considerable pressure on the enterprise, and the cost of the enterprise has increased invisibly

[0003] In the face of increasingly fierce competition in the industry and the rapid development of the packaging industry, users have higher and higher requirements for the quality and price of paper and cardboard. The production and output of domestic high-grade coated white cardboard continue to increase, and the market demand continues to intensify. With the advancement of environmental protection worldwide, the traditional method of using bleached chemical pulping to prepare white cardboard has been unable to meet the needs of modern enterprises

Images